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The electromagnetic interference shielding effectiveness of high aspect-ratio SiC nanofibers/epoxy composites

机译：高纵横比SiC纳米纤维/环氧树脂复合材料的电磁干扰屏蔽效能

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摘要

This paper presents the measured electromagnetic interference (EMI) shielding effectiveness of silicon carbide nanofibers (SiCNFs)/epoxy composites and the associated shielding mechanism. After obtaining silicon carbide nano-fibers, with an aspect ratio up to 300, SiCNFs/epoxy composites were prepared using an effective dispersion method. The relative complex permittivity, permeability, and EMI shielding effectiveness (SE) of the composites were measured in the frequency range of 26.5-40.0 GHz. The addition of SiCNFs was found to improve the EMI SE at a low threshold value of 10 wt% concentration. At this concentration, the EMI SE was larger than 10 dB over the entire range of 26.5-40.0 GHz, and had a maximum value of 22.9 dB at 40.0 GHz, corresponding to a more than 99% reduction of EMI radiation. The increased polarization interface/boundary and the formed effective conductive network were believed to be responsible for the enhancement of EMI SE, due to the addition of high aspect ratio SiCNFs. Shielding mechanism was studied by resolving the total SE into absorption and reflection portions. Absorption was found to be the major shielding mechanism and reflection had a secondary shielding effect for the threshold SiCNFs concentration case.
机译：本文介绍了所测量的碳化硅纳米纤维（SiCNFs）/环氧树脂复合材料的电磁干扰（EMI）屏蔽效果以及相关的屏蔽机理。在获得纵横比最大为300的碳化硅纳米纤维后，使用有效的分散方法制备了SiCNFs /环氧树脂复合材料。在26.5-40.0 GHz的频率范围内测量了复合材料的相对复介电常数，磁导率和EMI屏蔽效能（SE）。发现在低阈值浓度为10 wt％的情况下添加SiCNFs可以改善EMI SE。在此浓度下，EMI SE在26.5-40.0 GHz的整个范围内都大于10 dB，在40.0 GHz时具有22.9 dB的最大值，相当于EMI辐射降低了99％以上。由于增加了高纵横比SiCNF，增加的极化界面/边界和形成的有效导电网络被认为是EMI SE增强的原因。通过将总SE分解为吸收和反射部分来研究屏蔽机理。发现吸收是主要的屏蔽机制，反射对于阈值SiCNFs浓度情况具有次要屏蔽作用。

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